JP5919238B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater. In particular, the present invention relates to a warm air heater excellent in fuel saving performance.

  For example, a gas fan heater, which is a hot air heater, includes a gas burner and a blower fan in a main body case, and sucks room air by rotating the blower fan and blows air heated by the gas burner into the room. By doing so, the heating operation which raises room temperature is performed.

  In a warm air heater with a temperature control function, the set temperature set by the user using the temperature setting switch and the actual room temperature detected by the temperature sensor provided near the air inlet of the room air are substantially the same. Thus, the heating amount of the gas burner and the blowing amount of the blower fan are adjusted. In consideration of the case where the room temperature detected by the temperature sensor continues to rise even if the amount of heating of the gas burner is minimized, the gas burner is extinguished when the room temperature is higher than the set temperature by a predetermined temperature or more. Also known is a hot air heater that performs so-called on / off control, which ignites a gas burner when the temperature is lower than a predetermined temperature.

  Further, in a warm air heater having a save operation function (fuel saving operation function), after the room temperature detected by the temperature sensor reaches a set temperature, a save operation is performed in which the control temperature is gradually decreased. Yes. Specifically, after the initial heating operation is performed to substantially match the room temperature with the set temperature, the control temperature is maintained at the set temperature until 30 minutes have elapsed, and after 30 minutes, the control temperature is lowered by 1 ° C., and thereafter There has been proposed a warm air heater that performs a save operation that lowers the control temperature by 1 ° C. after 30 minutes.

  According to the hot air heater having the save operation function as described above, the heating amount is controlled so that the control temperature slightly lower than the set temperature is maintained for a predetermined time as the heating operation becomes longer. Person's perceived temperature does not change much. Therefore, the heating amount of the gas burner can be reduced, and the fuel consumption can be improved without causing discomfort to the user.

JP-A-8-189708 JP 2010-2063 A JP 2010-2064 A

  By the way, in a hot air heater such as a gas fan heater, to prevent forgetting to turn it off, if the heating operation is continued for a predetermined time, the gas burner is extinguished regardless of the heating operation time desired by the user. Then, a forced timer operation that forcibly ends the heating operation is executed. Therefore, when the user wants to continue the heating operation, it is necessary to turn on the operation switch again to restart the heating operation. In addition, even in a warm air heater that does not perform forced timer operation, another user starts the heating operation again within a short time after the user turns off the operation switch during the heating operation. There is a case. When such a heating operation is resumed, the room temperature often increases compared to when the previous heating operation was performed.

  However, in the warm air heater having the above-described conventional save operation function, after the initial heating operation for raising the room temperature to the set temperature is completed, the room warming due to the previous heating operation or the heating operation is restarted. Regardless of the stop time, since the control temperature is lowered by a predetermined save amount after a predetermined save time has elapsed, the save operation performed for the purpose of improving fuel efficiency is not sufficiently effective. There is.

  The present invention has been made to solve the above-described problems, and an object of the present invention is a case where heating operation is resumed within a short time from the end of the previous heating operation in a warm air heater having a save operation function. Furthermore, in consideration of the heating operation performed last time, there is to improve the fuel consumption performance without lowering the sensible temperature.

The present invention
A heating source;
A blower fan for sending warm air heated by the heating source into the room;
A room temperature detector for detecting room temperature;
An operation switch for instructing activation / deactivation of the heating operation;
A set temperature input section for inputting the set temperature;
When the operation switch is activated and heating operation is started, an initial heating operation control unit that controls the heating amount of the heating source so that the detected room temperature detected by the room temperature detection unit matches the set temperature;
When the detected room temperature reaches the set temperature by the initial heating operation, the heating amount of the heating source is adjusted so that the detected room temperature maintains a predetermined control temperature after maintaining the set temperature for a predetermined set temperature maintaining time. A save operation control unit that controls and lowers the control temperature in a predetermined save pattern;
A save pattern setting unit in which a plurality of save patterns for reducing the control temperature by a predetermined save amount as the predetermined save time elapses is set;
If the save operation is performed at the end of the heating operation, a save amount storage unit that stores an execution save amount executed to lower the control temperature from the start of the save operation to the end of the heating operation, and
The save operation control unit executes the save operation when the heating operation is completed, and when the operation switch is activated and the heating operation is resumed within a predetermined stop time after the heating operation is completed. The warm air heater performs a save operation with a save pattern set so that the set temperature maintenance time is shortened and the control temperature is lowered earlier as the save amount is larger.

  According to the hot air heater, when the save operation is executed when the heating operation is ended by forced timer operation or the user's operation of turning off the operation switch, the save amount executed so far is stored. Therefore, the progress degree of the save operation at the end of the previous heating operation can be determined.

Then, after the heating operation is completed in the state where the save operation has been performed, when the user restarts the heating operation by operating the operation switch, the more the execution save amount executed last time, that is, the save operation is performed. The longer the operation is performed, the warmer the entire room is, and the lower the room temperature is. In addition, as the amount of saved execution by save operation increases, heating operation is performed for a long time at a lower control temperature, so that the user becomes accustomed to the reduced room temperature according to the control temperature. Yes. Therefore, if the detected room temperature has reached the set temperature by the initial heating operation at the time of restart, the previous execution is performed without shortening the set temperature maintaining time for maintaining the set temperature and maintaining the high control temperature for a long time. Even if the save operation is executed in a save pattern in which the control temperature is lowered earlier according to the save amount, the sensible temperature is hardly lowered. Thereby, a fuel consumption can be improved, without impairing body temperature.

In the hot air heater, preferably,
The save operation control unit performs the save operation at the end of the heating operation, and when the operation switch is activated and the heating operation is resumed within the stop time after the heating operation ends, the stop time Is shorter, the save operation is performed with the save pattern set so as to lower the control temperature faster.

  The shorter the stop time from the end of the heating operation until the operation switch is activated and the restart of the heating operation, the less likely the room temperature and perceived temperature will decrease.Therefore, the save pattern that lowers the control temperature earlier in the heating operation after restarting By executing the save operation at, fuel efficiency can be further improved without impairing the temperature of experience.

In the hot air heater, preferably,
In the save pattern setting unit, when the detected room temperature reaches the set temperature by the initial heating operation, a predetermined set temperature maintaining time is maintained at the set temperature, and then a predetermined standard save time is passed. A standard save pattern for lowering the control temperature by the standard save amount , and a predetermined restart save time having a set temperature maintenance time shorter than the set temperature maintenance time of the standard save pattern and shorter than the standard save time. A plurality of restart save patterns that lower the control temperature by a predetermined restart save amount as time elapses are set,
The save amount storage unit stores an execution save amount executed to reduce the control temperature from the start of the save operation to the end of the heating operation when the save operation is executed with the standard save pattern at the end of the heating operation. And
The save operation control unit performs the save operation when the save operation is performed at the end of the heating operation, and when the operation switch is activated and the heating operation is resumed within the stop time after the heating operation is completed. The larger the amount , the shorter the set temperature maintenance time than the standard save pattern , and the save operation is performed with the restart save pattern set so as to lower the control temperature faster.

If the heating operation is executed for the first time, or if the save operation has been executed last time and if a long time has passed before restarting, the room temperature may be lowered. Therefore, by performing the save operation with the standard save pattern in which the control temperature gradually decreases, it is possible to prevent the temperature of the sensible temperature from decreasing. On the other hand, if the save operation was executed at the end of the previous heating operation, the larger the execution save amount , the shorter the set temperature maintenance time and the lower the control temperature earlier than the standard save pattern. Since the save operation is executed with the resumption save pattern, the fuel efficiency can be improved without impairing the sensed temperature.

  As described above, according to the present invention, the save operation is executed at the end of the heating operation, and when the operation switch is activated within the predetermined stop time from the end of the heating operation, the save operation in the heating operation at the restart is performed. As the amount of saved execution in the previous save operation is larger and the stop time is shorter, the control temperature is lowered earlier, so the indoor warming due to the save operation performed so far and the reduced room temperature It is possible to perform a heating operation according to the user's familiarity with, and a decrease in room temperature until resumption. Thereby, even if the heating operation is resumed within a short time, the heating operation can be efficiently performed with a small heating amount without excessively reducing the sensible temperature.

It is a schematic sectional drawing which shows an example of the warm air heater which concerns on embodiment of this invention. It is a control block diagram of the warm air heater which concerns on embodiment of this invention. It is a correlation diagram of time and control temperature which shows an example of the save pattern set with the warm air heater which concerns on embodiment of this invention. It is a flowchart which shows a part of control operation in the warm air heater which concerns on embodiment of this invention. It is a flowchart which shows a part of control operation in the warm air heater which concerns on embodiment of this invention.

Hereinafter, the hot air heater according to the present embodiment will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of a hot air heater according to the present embodiment. As shown in FIG. 1, a warm air heater 1 includes a duct 4, a blower fan 5, a gas burner (heating source) 6, an air supply duct 7, a gas supply pipe 8, and a main body case 2 installed indoors. A control unit C is provided.

  The duct 4 constitutes a hot air blowing path, and an air inlet 10 for taking in the indoor air s is opened in the back surface of the main body case 2, and a hot air outlet 11 is formed in the lower front portion of the main body case 2. It is open. An air filter 12 is detachably attached to the air inlet 10 in order to prevent dust and dirt from flowing into the duct 4.

  Further, a temperature sensor (room temperature detection unit) 26 constituted by a thermistor is attached to a location near the air inlet 10 so as to face the air inlet 10. The temperature sensor 26 outputs to the control unit C a signal indicating the detected room temperature that is regularly detected during the heating operation of the hot air heater 1.

  The blower fan 5 includes a fan motor 16 whose rotational speed changes in proportion to the energization amount, and a rotary blade 17 that is disposed in the duct 4 so as to face the air outlet 11 and is driven to rotate by the fan motor 16. The indoor air s is sucked from the air inlet 10 by the rotation of the rotary blade 17. Then, the sucked indoor air s is mixed with the combustion exhaust h of the gas burner 6 incorporated in the duct 4, and is sent to the room from the outlet 11 as warm air m. The blower fan 5 is provided with a rotation speed sensor 18 configured by a Hall element or the like that detects the rotation speed of the fan motor 16. The rotation speed sensor 18 outputs a signal corresponding to the rotation speed of the fan motor 16. Output to control unit C.

  In the gas burner 6 incorporated in the duct 4, a combustion plate 20 is disposed in the combustion cylinder 19, and an ignition electrode 21 for igniting a mixture of combustion air and fuel gas is disposed in the vicinity of the combustion plate 20. doing. The combustion exhaust h from the gas burner 6 is discharged from the combustion cylinder 19 into the duct 4. A thermocouple 22 for detecting the presence or absence of a combustion flame is disposed on the downstream side of the combustion plate 20. When the thermocouple 22 is exposed to the combustion flame of the gas burner 6, it generates a thermoelectromotive force according to the temperature of the combustion flame and outputs the thermoelectromotive force to the control unit C.

  The air supply duct 7 is a passage for supplying room air (combustion air) s and fuel gas to the gas burner 6, communicates with the gas burner 6 and the inside of the combustion cylinder 19, and is defined by the duct 4. An air inlet 23 for indoor air s opened at the back of the main body case 2 is provided. And the nozzle 24 attached to the front-end | tip of the gas supply pipe 8 is provided in the location by the side of the gas burner 6 of the air supply duct 7. FIG. In the air supply duct 7, the indoor air s is sucked from the intake port 23 by the rotation operation of the blower fan 5, and the sucked indoor air s is mixed with the fuel gas ejected from the nozzle 24 of the gas supply pipe 8. The air-fuel mixture is supplied to the gas burner 6. The air inlet 23 is covered with the air filter 12 together with the air inlet 10 of the duct 4.

  The gas supply pipe 8 is provided with solenoid valves 27 and 28 and a proportional control valve 29 in order from the upstream side. The solenoid valves 27 and 28 are opened by energization from the control unit C. When the energization is stopped, the solenoid valves 27 and 28 are closed to block the passage of fuel gas. The proportional control valve 29 is a valve whose opening increases with the amount of current supplied from the control unit C, and adjusts the amount of fuel gas supplied to the gas burner 6.

  An operation panel 30 is provided on the outer surface of the main body case 2, and various switches such as an operation switch 31, a temperature setting switch (set temperature input unit) 32, and a display unit 33 are disposed on the operation panel 30. Has been.

  The operation switch 31 outputs a signal indicating on / off of a main power source (not shown) of the hot air heater 1 to the control unit C by the user's on / off operation. The temperature setting switch 32 is a switch for setting a temperature desired by the user, and is set by increasing / decreasing the set temperature in units of 1 ° C., for example, by a predetermined operation by the user. The temperature setting switch 32 outputs a signal indicating the set temperature to the control unit C.

  The display unit 33 includes a liquid crystal panel, a digital display, and the like, and displays the current detected room temperature detected by the temperature sensor 26, the set temperature set by the temperature setting switch 32, and the like.

  As shown in FIG. 2, the control unit C having a microcomputer includes an operation control unit 50, a time measuring unit 51, an initial heating operation control unit 60, a save operation control unit 80, a timer operation control unit 90, a temperature adjustment control unit 100, A fan drive circuit 101, a proportional valve drive circuit 102, and the like are provided.

  When the user turns on the operation switch 31, the operation control unit 50 energizes the ignition electrode 21 for a predetermined time, opens the solenoid valves 27 and 28, sets the proportional control valve 29 to the ignition opening, and sets the gas burner. 6 is ignited. When the user turns off the operation switch 31, the solenoid valves 27 and 28 and the proportional control valve 29 are closed to extinguish the gas burner 6. In addition, if the output voltage of the thermocouple 22 becomes less than a predetermined value during combustion, the solenoid valves 27 and 28 and the proportional control valve 29 are closed to extinguish the gas burner 6.

  The initial heating operation control unit 60 determines the target combustion amount (heating amount) of the gas burner 6 so that the detected room temperature substantially coincides with the set temperature in the early stage of the heating operation, and instructs the temperature adjustment control unit 100 to instruct it.

  The save operation control unit 80 maintains a predetermined set temperature maintenance time and a control temperature at the set temperature after the detected room temperature reaches the set temperature by the initial heating operation, and then saves a predetermined save amount every time a predetermined save time elapses. Save pattern setting unit 81 that stores a plurality of save patterns set so as to lower the control temperature at (ΔT), and if the save operation has been executed at the end of the heating operation, it is executed until then The save amount storage unit 82 temporarily stores the execution save amount (ΣΔT).

  Then, the save operation control unit 80 performs the first heating operation after the power is turned on, or the save operation is executed at the end of the heating operation. The save operation control unit 80 sets a predetermined stop time (for example, 10 minutes) after the heating operation is completed. When the heating operation is restarted after exceeding, the target combustion amount is determined so that the save operation is performed according to the standard save pattern shown in Table 1, and the temperature control unit 100 is instructed. Further, the save operation control unit 80 performs the save operation at the end of the previous heating operation, and when the heating operation is resumed within the stop time, the previous save stored in the save amount storage unit 82 is performed. Based on the execution save amount executed in the operation and the stop time until the heating operation is restarted, the save operation is performed with any one of the save patterns 1 and 2 shown in Table 2 and Table 3. The target combustion amount is determined and the temperature control unit 100 is instructed. FIG. 3 shows the relationship between time and control temperature for a part of the standard save pattern and the restart save pattern, (a) shows the standard save pattern, and (b) shows that the previous execution save amount is 1 or more. Resume save pattern 1 less than 3, (c) Resume save pattern 1 with previous execution save amount of 3 or more and less than 6, (d) Resume save with last execution save amount of 1 or more and less than 3. Pattern 2 is shown. In the figure, the set temperature (Ts) and the heating conditions of the initial heating operation in the restart save pattern are set to be the same for comparison.

  The save pattern set in the present embodiment will be described. As shown in Tables 1 to 3 and FIG. 3, each save time is a predetermined time after the detected room temperature reaches the set temperature in the initial heating operation. After the control temperature is maintained at the set temperature until the set temperature maintenance time has elapsed, the time set for decreasing the control temperature by a predetermined save amount is shown. Each save amount indicates a temperature decrease width (ΔT) for decreasing the control temperature. For example, when the detected room temperature rises to the set temperature and the save operation is started, in the standard save pattern, the control temperature is first set after maintaining the set temperature for a set temperature maintenance time (for example, 30 minutes). Each time the save time (for example, 10 minutes) elapses, the control temperature is set to decrease by one save amount (for example, −1 / 3 ° C. = about −0.33 ° C.). In the restart save pattern 1, when the control temperature is shorter than the standard save pattern, the set temperature maintenance time (for example, 10 minutes) is maintained at the set temperature, and the previous execution save amount is 1 or more and less than 3, Each time a save time (for example, 5 minutes) elapses, the control temperature is set to decrease by one save amount. Further, in the restart save pattern 2, similarly, the control temperature is shorter than the standard save pattern, and after the set temperature maintenance time (for example, 7 minutes) is maintained at the set temperature, the previous execution save amount is 1 or more and less than 3. In some cases, the control temperature is set to decrease by one save amount each time a save time (for example, 3 minutes) elapses. Therefore, for example, when the previous heating operation is the first heating operation, the save operation is executed with the standard save pattern, but when the heating operation is resumed, the control temperature is lowered earlier than the standard save pattern. The save operation is executed with the restart save pattern set as follows. Thereby, fuel consumption can be improved. The set temperature maintenance time, the save time, and the save amount are obtained by experiments based on the sensory temperature. In any save pattern, the control temperature decreases by a maximum of 6 save amounts (−2 ° C. However, these can be set as appropriate according to the heating capacity of the hot air heater 1 or the like.

  Moreover, as understood from Tables 2 to 3 and FIG. 3, the control temperature is lowered earlier as the execution save amount executed until the end of the heating operation in the save operation in the previous heating operation is larger. The resume save pattern is set in. That is, if the forced timer operation functions in a short time after the save operation is started in the previous heating operation or the user turns off the operation switch 31, the save operation is not executed for a long time. The overall temperature may not have risen, or the user may not be used to the room temperature that has risen to the set temperature. Therefore, if the control temperature is lowered too early, the sensible temperature tends to fall. On the other hand, if the save operation has been executed to some extent in the previous heating operation, the temperature of the entire room has increased, and if the heating operation has been performed for a long time at the reduced control temperature, the user It is in a state accustomed to the room temperature which was lowered according to the control temperature. Even in the heating operation after resumption, the initial heating operation is executed so that the detected room temperature becomes the set temperature. Therefore, if the detected room temperature has reached the set temperature, the restart save is performed to lower the control temperature earlier. Even if you perform a save operation with a pattern, the sensible temperature will not drop significantly. Therefore, fuel efficiency can be improved without impairing the temperature of the body. For this reason, even if the stop time is about the same, for example, in both the resume save patterns 1 and 2, the previous execution save amount is 1 when the previous execution save amount is 3 or more and less than 6. As described above, the save amount is set to increase in a shorter time than that in the case of less than 3, and when the previous execution save amount is 6, the save pattern in the previous execution save amount is 3 As described above, the save amount is set to increase in a shorter time than that in the case of less than 6.

  Further, as understood from the comparison of the save patterns in Tables 2 to 3 and FIG. 3, the stop time from the end of the previous heating operation until the heating operation is restarted by the user turning on the operation switch 31. The restart save pattern is set so that the shorter the is, the lower the control temperature is earlier. That is, after a certain period of time has elapsed since the user turned off the operation switch 31, when another user resumes the heating operation, the room temperature has decreased to some extent, but compared to when the heating operation is performed for the first time. Room temperature is high. In addition, for example, when the forced timer operation functions during the previous heating operation and the user immediately turns on the operation switch 31 in order to continue the heating operation, the decrease in the room temperature is small even after the heating operation is completed. Therefore, as the stop time is shorter, the fuel economy can be further improved without causing a decrease in the perceived temperature by performing the save operation with the restart save pattern in which the control temperature is lowered earlier. Therefore, even if the previous execution save amount is the same, the resume save pattern 2 is set so that the save amount increases in a shorter time than the resume save pattern 1.

  When the elapsed time from the start of the heating operation measured by the timer unit 51 elapses after a predetermined operation stop time (for example, 3 hours), the timer operation control unit 90 compulsorily terminates the heating operation, 28 and the proportional control valve 29 are closed, and the gas burner 6 is extinguished.

  Based on instructions from the initial heating operation control unit 60 and the save operation control unit 80, the temperature adjustment control unit 100 determines the heating capacity (levels 1 to 7) so that the detected room temperature becomes a predetermined set temperature or control temperature. Then, the proportional valve drive circuit 102 and the fan drive circuit 101 are controlled.

  The proportional valve drive circuit 102 energizes the proportional control valve 29 with a current (1 stage to 7 stages) corresponding to the heating capacity (level 1 to level 7) determined by the temperature control unit 100. The fan drive circuit 101 energizes the fan motor 16 with a fan current that provides a fan speed suitable for the heating capacity (level 1 to level 7) determined by the temperature control unit 100.

  Next, with reference to FIGS. 4-5, the control operation | movement of the hot air heater of this Embodiment is demonstrated. In the hot air heater according to the present embodiment, when the operation switch 31 is turned on and the heating operation is started, the heating operation is not stopped by the operation of the operation switch 31 or the forced timer operation. Although the save operation is automatically executed in a predetermined save pattern after the heating operation, a save operation switch is separately provided on the operation panel 30 and the save operation is performed only when the save operation switch is turned on. May be configured to be executed.

  When the user inputs a set temperature with the temperature setting switch 32 and turns on the operation switch 31, the control operation of the hot air heater 1 by the control unit C is started (step ST1).

  When the heating operation is started, first, the execution save amount is read from the save amount storage unit 82 in order to determine whether or not the save operation has been executed at the end of the previous heating operation (step ST2).

  Next, the initial heating operation is started (step ST3). In this initial heating operation, before the gas burner 6 is combusted, a pre-purge is performed in which the fan drive circuit 101 rotates the fan motor 16 for a predetermined time (for example, 30 seconds).

  When the pre-purge is completed, the solenoid valves 27 and 28 are opened by energization from the operation control unit 50. Further, the energization from the proportional valve drive circuit 102 maximizes the opening degree of the proportional control valve 29, and the energization from the fan drive circuit 101 maximizes the rotational speed of the fan motor 16, and then the energization is performed to the ignition electrode 21. Then, the gas burner 6 is ignited.

  When the gas burner 6 is ignited, the gas burner 6 is burned at the maximum combustion amount for one minute, and then the target combustion amount is determined based on the temperature difference between the set temperature and the detected room temperature, and based on the determined target combustion amount. Thus, the temperature control unit 100 determines the heating capacity, and the proportional valve driving circuit 102 adjusts the opening degree of the proportional control valve 29. Further, the target rotational speed of the fan motor 16 is varied by the fan drive circuit 101 in accordance with the determined target combustion amount so that the target rotational speed and the actual rotational speed detected by the rotational speed sensor 18 coincide with each other. In addition, the energization amount to the fan motor 16 is adjusted. Thereby, the initial heating operation is performed so that the detected room temperature approaches the set temperature.

  When the detected room temperature reaches the set temperature by the initial heating operation (Yes in step ST4), it is confirmed whether or not the eco-operation mode is resumed. In this case, the standard save pattern is selected from the save pattern setting unit 81 described above, and the set temperature maintenance time is set to 30 minutes, and each save time is set to 10 minutes (step ST9).

  Further, although the current heating operation is in the eco operation mode (Yes in step ST5), the execution save amount in the previous save operation is not stored (No in step ST6), that is, in the previous heating operation. When the heating operation is finished before the control temperature is lowered, the standard save pattern is selected in the same manner as described above (step ST9).

  Further, when the previous execution save amount is stored (Yes in step ST6), that is, when a certain amount of save operation is executed by the end of the previous heating operation, the operation switch from the end of the previous heating operation is performed. It is determined whether or not the stop time from when 31 is turned on until the heating operation is resumed is equal to or shorter than a predetermined first stop time (for example, 10 minutes) (step ST7). If the stop time exceeds the first stop time (No in step ST7), it is considered that the room temperature has dropped, so the standard save pattern is selected in the same manner as described above (step ST9).

  If the stop time is less than or equal to the first stop time (Yes in step ST7), it is further determined whether or not the stop time is less than or equal to a second stop time (for example, 5 minutes) (step ST8). If the stop time exceeds the second stop time (No in step ST8), it is considered that the room temperature has not greatly decreased due to the previous heating operation. The restart save pattern 1 is read, and the set temperature maintenance time is set to 10 minutes, and each save time is set to 5 minutes (step ST10).

  Further, when the stop time is equal to or shorter than the second stop time (Yes in step ST8), the heating operation is started immediately after the previous heating operation is completed, and the room temperature is considered to have hardly decreased. The resume save pattern 2 corresponding to the previous execution save amount is read from the setting unit 81, and the set temperature maintenance time is set to 7 minutes, and each save time is set to 3 minutes (step ST11).

  Next, when the user turns off the operation switch 31 or the heating operation is not stopped due to the lapse of a predetermined time by the forced timer operation (No in step ST12), the set temperature maintained in each save pattern is maintained. It is determined whether time has elapsed (step ST13). When the set temperature maintenance time elapses (Yes in step ST13), the control temperature is decreased by a predetermined save amount each time the save time of each selected save pattern elapses (steps ST14 to ST17). . As the control temperature decreases, the target combustion amount is determined so as to coincide with the control temperature at which the detected room temperature decreases, and the temperature control unit 100 determines the heating capacity based on the determined target combustion amount, Accordingly, the opening degree of the proportional control valve 29 and the rotational speed of the blower fan 5 are adjusted. If the heating operation is stopped before the first decrease in the control temperature is executed (Yes in step ST12), the save operation is terminated without storing the current execution save amount.

  During the save operation, when the operation of the operation switch 31 is turned off or the stop operation is performed due to the elapse of a predetermined time in the forced timer operation (Yes in step ST16), or when the save operation is executed up to the maximum save amount ( In step ST17, Yes), the execution save amount executed so far is stored in the save amount storage unit 82 (step ST18). The stored execution save amount is used in the save operation when the heating operation is resumed within a predetermined stop time. When the save operation ends, the temperature control operation is performed so as to coincide with the control temperature at which the detected room temperature has decreased.

  As described above, according to the hot air heater 1 of the present embodiment, when the heating operation is finished and the heating operation is resumed within a predetermined stop time, the save operation in the heating operation at the time of resumption is Because the execution save amount in the previous save operation is larger, and the stop time from the end of the previous heating operation to the restart of the heating operation is shorter, it is executed with a restart save pattern that lowers the control temperature earlier, Even when the heating operation is resumed within a short time, the fuel consumption can be improved without causing a decrease in the temperature of the sensible temperature.

  In the above embodiment, the gas fan heater has been described as an example. However, the present invention is not limited to this, and can be applied to an FF type hot air heater or an oil type hot air heater. .

  In the above embodiment, only one type of standard save pattern is set. However, a plurality of sets may be set in consideration of heating load characteristics such as initial room temperature and temperature rise in the initial heating operation, and restart saving is possible. Different patterns may be provided with different save times and save amounts.

1 Hot air heater 5 Blower fan 6 Gas burner (heating source)
26 Temperature sensor (room temperature detector)
31 Operation switch 31 Set temperature switch (Set temperature input section)
60 Initial heating operation control unit 80 Save operation control unit 81 Save pattern setting unit 82 Save amount storage unit

Claims (3)

A heating source;
A blower fan for sending warm air heated by the heating source into the room;
A room temperature detector for detecting room temperature;
An operation switch for instructing activation / deactivation of the heating operation;
A set temperature input section for inputting the set temperature;
When the operation switch is activated and heating operation is started, an initial heating operation control unit that controls the heating amount of the heating source so that the detected room temperature detected by the room temperature detection unit matches the set temperature;
When the detected room temperature reaches the set temperature by the initial heating operation, the heating amount of the heating source is adjusted so that the detected room temperature maintains a predetermined control temperature after maintaining the set temperature for a predetermined set temperature maintaining time. A save operation control unit that controls and lowers the control temperature in a predetermined save pattern;
A save pattern setting unit in which a plurality of save patterns for reducing the control temperature by a predetermined save amount as the predetermined save time elapses is set;
If the save operation is performed at the end of the heating operation, a save amount storage unit that stores an execution save amount executed to lower the control temperature from the start of the save operation to the end of the heating operation, and
The save operation control unit executes the save operation when the heating operation is completed, and when the operation switch is activated and the heating operation is resumed within a predetermined stop time after the heating operation is completed. A warm air heater that performs a save operation with a save pattern that is set so that the set temperature maintenance time is shortened and the control temperature is lowered earlier as the amount of save increases. The warm air heater according to claim 1,
The save operation control unit performs the save operation at the end of the heating operation, and when the operation switch is activated and the heating operation is resumed within the stop time after the heating operation ends, the stop time A warm air heater that performs a save operation with a save pattern that is set so as to decrease the control temperature more quickly as the temperature is shorter. The hot air heater according to claim 1 or 2,
In the save pattern setting unit, when the detected room temperature reaches the set temperature by the initial heating operation, a predetermined set temperature maintaining time is maintained at the set temperature, and then a predetermined standard save time is passed. A standard save pattern for lowering the control temperature by the standard save amount , and a predetermined restart save time having a set temperature maintenance time shorter than the set temperature maintenance time of the standard save pattern and shorter than the standard save time. A plurality of restart save patterns that lower the control temperature by a predetermined restart save amount as time elapses are set,
The save amount storage unit stores an execution save amount executed to reduce the control temperature from the start of the save operation to the end of the heating operation when the save operation is executed with the standard save pattern at the end of the heating operation. And
The save operation control unit performs the save operation when the save operation is performed at the end of the heating operation, and when the operation switch is activated and the heating operation is resumed within the stop time after the heating operation is completed. The hot air heater which performs a save operation with the restart save pattern set so that the set temperature maintenance time is shorter than the standard save pattern and the control temperature is lowered earlier as the amount is larger.